- Spectrophotometer recording at adjacent teeth. A spectrophotometer (Crystaleye, Olympus, Japan) will be used to select and digitally record the shade for each adjacent tooth. The sterilizable adapter of the spectrophotometer's intra-oral camera will be positioned on the alveolar process over the respective adjacent tooth. Once the resulting video image of the tooth is centered in an orthoradial way in the measuring square depicted on the computer screen, the spectrophotometric data will be recorded three consecutive times for each tooth. This data will be later compared with records obtained from final crowns by repeating the spectrophotometer measurement over the control and test group restorations. (Figure 4)